Re: [PATCH V14] VECT: Add decrement IV iteration loop control by variable amount support

[Richard Sandiford via Gcc-patches]

I'll look at the samples tomorrow, but just to address one thing:

钟居哲 <juzhe.zh...@rivai.ai> writes:
>>> What gives the best code in these cases?  Is emitting a multiplication
>>> better?  Or is using a new IV better?
> Could you give me more detail information about "new refresh IV" approach.
> I'd like to try that.

By “using a new IV” I meant calling vect_set_loop_controls_directly
for every rgroup, not just the first.  So in the earlier example,
there would be one decrementing IV for x and one decrementing IV for y.

Thanks,
Richard